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The exotic emerald ash borer, Agrilus planipennis (Coleoptera: Buprestidae), was first discovered in North America in southeastern Michigan in 2002. This beetle has killed millions of ash (Fraxinus spp.) trees in several states in the United States and in Canada. This beetle is difficult to detect when it invades new areas or occurs at low density, and for the foreseeable future, girdled trap tree and ground surveys will be important tools for detecting emerald ash borer populations. A field experiment was established at Straits State Park, St. Ignace, Michigan in 2008 to characterize the effectiveness of different trap types in an area of known low density population of emerald ash borer. This study was designed to compare the effectiveness of girdled and non-girdled trap trees and the baited prism traps to detect adults and larvae of the emerald ash borer. Canopy assessments of trees were carried out to determine if the canopy condition was predictive of whether a tree was infested with emerald ash borer or not. Adult beetles were not detected using the baited purple prism trap during the trapping survey, and only one adult beetle was caught on a girdled trap tree during the flight season. Eight of the girdled trap trees contained larvae when peeled, and only one tree containing a purple prism trap contained larvae. No non-girdled trap trees were infested. Canopy condition of these trees was not predictive of infestation. Of the girdled trees, infested trees were larger in diameter than non-infested trees. The use of 17 large girdled trap trees may be the most effective tool for detecting emerald ash borer at low density, whereas baited purple prism traps may be ineffective when the population density of the insect is very low. Introduction The exotic emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae) (EAB), was first discovered in North America in southeastern Michigan, USA, and Windsor, Ontario, Canada in 2002 (Cappaert et al. 2005, Siegert et al. 2007). This insect pest of North American ash (Fraxinus spp.) is thought to have been introduced into Michigan from Asia in the 1990s based on recent dendrochronological evidence (Cappaert et al. 2005). It has been estimated that approximately 50 million trees have been infested with EAB in Michigan, northern Ohio, and northern Indiana (Smith et al. unpublished). Infestations are also known to occur in Illinois, Indiana, Maryland, Michigan, Missouri, Ohio, Pennsylvania, Virginia, West Virginia, and Wisconsin, USA, and Quebec, Canada (EAB Info 2008). This boring beetle is thought to have arrived from Asia as a stowaway in solid wood packing material (Poland & McCullough 2006), and continues to spread both naturally and from human-assisted movement of ash nursery stock, logs, and firewood, initiating outlier infestations (Poland 2007). In North America, ash species in the genus Fraxinus are the only suitable host of EAB, and are threatened by the continued spread of this pest (Anulewicz et al. 2008). Adult EAB flight starts in May and goes through August with the timing in this window varying according to location. After emerging from the host, the beetles feed on

Detection and landing behavior of emerald ash borer, <i>Agrilus planipennis</i>, at low population density